patch 8.1.0815: dialog for file changed outside of Vim not tested

Problem:    Dialog for file changed outside of Vim not tested.
Solution:   Add a test.  Move FileChangedShell test.  Add 'L' flag to
            feedkeys().

src/version.c

@@ -788,7 +788,9 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
-    84,
+    815,
+/**/
+    814,
 /**/
     813,
 /**/